How to use the nhentai.doujinshi.Doujinshi function in nhentai

for i in range(1, min(self.pages, len(self.ext)) + 1):
                download_queue.append('%s/%d/%d.%s' % (IMAGE_URL, int(self.img_id), i, self.ext[i-1]))

            self.downloader.download(download_queue, self.filename)

            '''
            for i in range(len(self.ext)):
                download_queue.append('%s/%d/%d.%s' % (IMAGE_URL, int(self.img_id), i+1, EXT_MAP[self.ext[i]]))
            '''

        else:
            logger.critical('Downloader has not been loaded')


if __name__ == '__main__':
    test = Doujinshi(name='test nhentai doujinshi', id=1)
    print(test)
    test.show()
    try:
        test.download()
    except Exception as e:
        print('Exception: %s' % str(e))

if options.is_save_download_history:
            with DB() as db:
                data = set(db.get_all())

            doujinshi_ids = list(set(doujinshi_ids) - data)

    if doujinshi_ids:
        for i, id_ in enumerate(doujinshi_ids):
            if options.delay:
                time.sleep(options.delay)

            doujinshi_info = doujinshi_parser(id_)

            if doujinshi_info:
                doujinshi_list.append(Doujinshi(name_format=options.name_format, **doujinshi_info))

            if (i + 1) % 10 == 0:
                logger.info('Progress: %d / %d' % (i + 1, len(doujinshi_ids)))

    if not options.is_show:
        downloader = Downloader(path=options.output_dir, size=options.threads,
                                timeout=options.timeout, delay=options.delay)

        for doujinshi in doujinshi_list:

            doujinshi.downloader = downloader
            doujinshi.download()
            if options.is_save_download_history:
                with DB() as db:
                    db.add_one(doujinshi.id)